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A fun, free platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
No Way Back Home Mathematics 100
Beatboxer Symmetric Ciphers 150
MDFlag Hash Functions 125
TLS Handshake Crypto on the Web 15
Saying Hello Crypto on the Web 20
Weekly Top Users
#1 4yn 5235
#2 remy_o 4610
#3 GenniGe 2275
#4 GaLaXy1036 2050
#5 Devrar 1895
Recent Solves
RSA Starter 1 nuclear_nadal
Lazy CBC LouisJ
JWT Secrets istvanseres
Base64 s4pu
XOR Starter guantou
Recent Solutions
Point Addition Cabbache 0
No Way Back Home ConnorM 2
Legendre Symbol Amol 0
Quadratic Residues Amol 0
No Way Back Home FedericoUT 0

Level Up

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